condition mean min max ZT0-3 1.443835 1.443835 1.443835 ZT4-7 1.4666350000000001 1.4666350000000001 1.4666350000000001 ZT8-11 1.722885 1.722885 1.722885 ZT12-15 1.2555165000000001 1.2555165000000001 1.2555165000000001 ZT16-19 3.043435 3.043435 3.043435 ZT20-23 2.610325 2.610325 2.610325